Allison Grant (left) and Spencer Rinkus (right) of Uber discuss openings for drivers with a job seeker in San Francisco.

Allison Grant (left) and Spencer Rinkus (right) of Uber discuss...

In her corner of the job fair, public sector recruiter Maria Flores was trying to fill blue-collar jobs that paid around $60,000. At a neighboring table, Rebecca Greene said she would talk to a thousand people about jobs paying $15 to $45 an hour at her company - if a thousand had showed up.

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